From: Souvik Banerjee <souvik1997@gmail.com>
Date: Fri, 30 Mar 2018 14:32:42 -0500
Subject: [PATCH] blktrace: fix comment in blktrace_api.h
Git-commit: a5040c2d8dd732252609cde84ee3cdd6f1b1f927
Patch-mainline: v4.17-rc1
References: bsc#1104967,FATE#325924
The `__u64 time` field of the blk_io_trace struct refers to
the time in nanoseconds, not in microseconds. It is set in
__blk_add_trace, which does the following:
t->time = ktime_to_ns(ktime_get());
ktime_to_ns returns ktime_t in nanoseconds, not microseconds.
Signed-off-by: Souvik Banerjee <souvik1997@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
include/uapi/linux/blktrace_api.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/blktrace_api.h b/include/uapi/linux/blktrace_api.h
index 3c50e07ee833..690621b610e5 100644
--- a/include/uapi/linux/blktrace_api.h
+++ b/include/uapi/linux/blktrace_api.h
@@ -101,7 +101,7 @@ enum blktrace_notify {
struct blk_io_trace {
__u32 magic; /* MAGIC << 8 | version */
__u32 sequence; /* event number */
- __u64 time; /* in microseconds */
+ __u64 time; /* in nanoseconds */
__u64 sector; /* disk offset */
__u32 bytes; /* transfer length */
__u32 action; /* what happened */
--
2.16.4